Most rivers have an upper (youthful) course, a middle (mature) course and a lower (old age) course. These stages are marked by variations in the characteristics of the river. More »

The three stages in a river or stream's development are youthful, mature and old. Geologists classify streams along with rivers and view their development as a flowing body of water progressing along the same three stage... More »

The Nile River has had five stages in its evolution, with the first being the Eonile that formed approximately 5 million years ago, coinciding with the drying up of the Mediterranean Sea during the Miocene period. The ot... More »

According to About.com, mature rivers are bodies of water that flow over wider valleys and snake along flat plains. The meandering streams then create larger loops that develop into oxbow lakes. More »

A river system is a way of describing the larger networks of streams, lakes and rivers that are part of a larger river's network of tributaries and distributaries; for example, multiple rivers, including the Ohio, Red an... More »

The River Rhine is one of the most well-known rivers in Europe, and it is the longest river in Germany. The river flows through six countries and originates as a thin stream in the Swiss Alps; however, as the river flows... More »

The River Danube begins in the Black Forest of Germany, where the rivers Berg and Brigach meet in the town of Donaueschingen. The Danube is the second longest river in Europe, after the Volta. It passes through four capi... More »